If you are trying to install a plugin in Chrome and run into a “Not Compatible” error message followed by “This application is not supported” then there is a quick and easy solution.

The full error message reads:

This application is not supported on this computer. Installation has been disabled. The following problems are detected: NPAPI plugin is required by this app.

This is because of something called NPAPI being disabled by Chrome for various reasons. Most of them good including security issues with NPAPI plugins. However if you absolutely must run an incompatible NPAPI plugin then here is how to do it.